diff --git a/wp-admin/comment.php b/wp-admin/comment.php
index 129d621137..1fb137d92f 100644
--- a/wp-admin/comment.php
+++ b/wp-admin/comment.php
@@ -123,7 +123,7 @@ if ( 'spam' == $_GET['dt'] ) {
 </tr>
 <?php } ?>
 <tr>
-<th scope="row" valign="top"><?php echo _c('Comment|noun'); ?></th>
+<th scope="row" valign="top"><?php /* translators: field name in comment form */ echo _x('Comment', 'noun'); ?></th>
 <td><?php echo $comment->comment_content; ?></td>
 </tr>
 </table>
diff --git a/wp-admin/edit-form-advanced.php b/wp-admin/edit-form-advanced.php
index a0dff5db0d..1eb3365e2e 100644
--- a/wp-admin/edit-form-advanced.php
+++ b/wp-admin/edit-form-advanced.php
@@ -191,7 +191,8 @@ if ( 'private' == $post->post_status ) {
 
 
 <?php
-$datef = _c( 'M j, Y @ G:i|Publish box date format');
+// translators: Publish box date formt, see http://php.net/date
+$datef = __( 'M j, Y @ G:i' );
 if ( 0 != $post->ID ) {
 	if ( 'future' == $post->post_status ) { // scheduled for publishing at a future date
 		$stamp = __('Scheduled for: <b>%1$s</b>');
@@ -468,7 +469,9 @@ function post_comment_meta_box($post) {
 <thead>
 	<tr>
     <th scope="col" class="column-author"><?php _e('Author') ?></th>
-    <th scope="col" class="column-comment"><?php echo _c('Comment|noun') ?></th>
+    <th scope="col" class="column-comment">
+		<?php /* translators: field name in comment form */ echo _x('Comment', 'noun'); ?>
+	</th>
   </tr>
 </thead>
 <tbody id="the-comment-list" class="list:comment">
diff --git a/wp-admin/edit-form-comment.php b/wp-admin/edit-form-comment.php
index 531db65b08..b32d53b7d7 100644
--- a/wp-admin/edit-form-comment.php
+++ b/wp-admin/edit-form-comment.php
@@ -48,14 +48,15 @@ $url = attribute_escape( $comment->comment_author_url );
 <div id="misc-publishing-actions">
 
 <div class="misc-pub-section" id="comment-status-radio">
-<label class="approved"><input type="radio"<?php checked( $comment->comment_approved, '1' ); ?> name="comment_status" value="1" /><?php echo _c('Approved|adjective') ?></label><br />
-<label class="waiting"><input type="radio"<?php checked( $comment->comment_approved, '0' ); ?> name="comment_status" value="0" /><?php echo _c('Pending|adjective') ?></label><br />
-<label class="spam"><input type="radio"<?php checked( $comment->comment_approved, 'spam' ); ?> name="comment_status" value="spam" /><?php echo _c('Spam|adjective'); ?></label>
+<label class="approved"><input type="radio"<?php checked( $comment->comment_approved, '1' ); ?> name="comment_status" value="1" /><?php /* translators: comment type radio button */ echo _x('Approved', 'adjective') ?></label><br />
+<label class="waiting"><input type="radio"<?php checked( $comment->comment_approved, '0' ); ?> name="comment_status" value="0" /><?php /* translators: comment type radio button */ echo _x('Pending', 'adjective') ?></label><br />
+<label class="spam"><input type="radio"<?php checked( $comment->comment_approved, 'spam' ); ?> name="comment_status" value="spam" /><?php /* translators: comment type radio button */ echo _x('Spam', 'adjective'); ?></label>
 </div>
 
 <div class="misc-pub-section curtime misc-pub-section-last">
 <?php
-$datef = _c( 'M j, Y @ G:i|Publish box date format');
+// translators: Publish box date formt, see http://php.net/date
+$datef = __( 'M j, Y @ G:i' );
 $stamp = __('Submitted on: <b>%1$s</b>');
 $date = date_i18n( $datef, strtotime( $comment->comment_date ) );
 ?>
diff --git a/wp-admin/edit-page-form.php b/wp-admin/edit-page-form.php
index 18658044ef..1050c2baae 100644
--- a/wp-admin/edit-page-form.php
+++ b/wp-admin/edit-page-form.php
@@ -181,7 +181,8 @@ if ( 'private' == $post->post_status ) {
 </div><?php // /misc-pub-section ?>
 
 <?php
-$datef = _c( 'M j, Y @ G:i|Publish box date format');
+// translators: Publish box date formt, see http://php.net/date
+$datef = __( 'M j, Y @ G:i' );
 if ( 0 != $post->ID ) {
 	if ( 'future' == $post->post_status ) { // scheduled for publishing at a future date
 		$stamp = __('Scheduled for: <b>%1$s</b>');
diff --git a/wp-admin/edit-pages.php b/wp-admin/edit-pages.php
index fb7281cbd4..55321f44e1 100644
--- a/wp-admin/edit-pages.php
+++ b/wp-admin/edit-pages.php
@@ -290,7 +290,9 @@ if ( 1 == count($posts) && is_singular() ) :
 <table class="widefat" cellspacing="0">
 <thead>
   <tr>
-    <th scope="col" class="column-comment"><?php echo _c('Comment|noun') ?></th>
+    <th scope="col" class="column-comment">
+		<?php  /* translators: column name */ echo _x('Comment', 'column name') ?>
+	</th>
     <th scope="col" class="column-author"><?php _e('Author') ?></th>
     <th scope="col" class="column-date"><?php _e('Submitted') ?></th>
   </tr>
diff --git a/wp-admin/gears-manifest.php b/wp-admin/gears-manifest.php
index 287379089d..43d41cf7c6 100644
--- a/wp-admin/gears-manifest.php
+++ b/wp-admin/gears-manifest.php
@@ -20,6 +20,12 @@ function __() {}
  */
 function _c() {}
 
+/**
+ * @ignore
+ */
+function _x() {}
+
+
 /**
  * @ignore
  */
diff --git a/wp-admin/includes/dashboard.php b/wp-admin/includes/dashboard.php
index bae225cdda..13bd158085 100644
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -526,7 +526,7 @@ function _wp_dashboard_recent_comments_row( &$comment, $show_date = true ) {
 		$actions['edit'] = "<a href='comment.php?action=editcomment&amp;c={$comment->comment_ID}' title='" . __('Edit comment') . "'>". __('Edit') . '</a>';
 		//$actions['quickedit'] = '<a onclick="commentReply.open(\''.$comment->comment_ID.'\',\''.$comment->comment_post_ID.'\',\'edit\');return false;" class="vim-q" title="'.__('Quick Edit').'" href="#">' . __('Quick&nbsp;Edit') . '</a>';
 		$actions['reply'] = '<a onclick="commentReply.open(\''.$comment->comment_ID.'\',\''.$comment->comment_post_ID.'\');return false;" class="vim-r hide-if-no-js" title="'.__('Reply to this comment').'" href="#">' . __('Reply') . '</a>';
-		$actions['spam'] = "<a href='$spam_url' class='delete:the-comment-list:comment-$comment->comment_ID::spam=1 vim-s vim-destructive' title='" . __( 'Mark this comment as spam' ) . "'>" . _c( 'Spam|verb' ) . '</a>';
+		$actions['spam'] = "<a href='$spam_url' class='delete:the-comment-list:comment-$comment->comment_ID::spam=1 vim-s vim-destructive' title='" . __( 'Mark this comment as spam' ) . "'>" . /* translators: mark as spam link */  _x( 'Spam', 'verb' ) . '</a>';
 		$actions['delete'] = "<a href='$delete_url' class='delete:the-comment-list:comment-$comment->comment_ID delete vim-d vim-destructive'>" . __('Delete') . '</a>';
 
 		$actions = apply_filters( 'comment_row_actions', $actions, $comment );
@@ -566,8 +566,8 @@ function _wp_dashboard_recent_comments_row( &$comment, $show_date = true ) {
 				endswitch;
 				$type = wp_specialchars( $type );
 			?>
-
-			<h4 class="comment-meta"><?php printf( __( '%1$s on %2$s' ), "<strong>$type</strong>", $comment_post_link ); ?></h4>
+			<?php /* translators: %1$s is type of comment, %2$s is link to the post */ ?>
+			<h4 class="comment-meta"><?php printf( _x( '%1$s on %2$s', 'dashboard' ), "<strong>$type</strong>", $comment_post_link ); ?></h4>
 			<p class="comment-author"><?php comment_author_link(); ?></p>
 
 			<?php endif; // comment_type ?>
@@ -630,19 +630,22 @@ function wp_dashboard_incoming_links_output() {
 		$content = wp_html_excerpt($content, 50) . ' ...';
 
 		if ( $link )
-			$text = _c( '%1$s linked here <a href="%2$s">saying</a>, "%3$s"|feed_display' );
+			/* translators: incoming links feed, %1$s is other person, %3$s is content */
+			$text = __( '%1$s linked here <a href="%2$s">saying</a>, "%3$s"' );
 		else
-			$text = _c( '%1$s linked here saying, "%3$s"|feed_display' );
+			/* translators: incoming links feed, %1$s is other person, %3$s is content */
+			$text = __( '%1$s linked here saying, "%3$s"' );
 
 		if ( $show_date ) {
 			if ( $show_author || $show_summary )
-				$text .= _c( ' on %4$s|feed_display' );
+				/* translators: incoming links feed, %4$s is the date */
+				$text .= ' ' . __( 'on %4$s' );
 			$date = wp_specialchars( strip_tags( $item->get_date() ) );
 			$date = strtotime( $date );
 			$date = gmdate( get_option( 'date_format' ), $date );
 		}
 
-		echo "\t<li>" . sprintf( _c( "$text|feed_display" ), $publisher, $link, $content, $date ) . "</li>\n";
+		echo "\t<li>" . sprintf( $text, $publisher, $link, $content, $date ) . "</li>\n";
 	}
 
 	echo "</ul>\n";
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index f4a7362ee9..4a285be09a 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -735,7 +735,8 @@ function tag_rows( $page = 1, $pagesize = 20, $searchterms = '', $taxonomy = 'po
 function wp_manage_posts_columns() {
 	$posts_columns = array();
 	$posts_columns['cb'] = '<input type="checkbox" />';
-	$posts_columns['title'] = _c('Post|noun');
+	/* translators: manage posts column name */
+	$posts_columns['title'] = _x('Post', 'column name');
 	$posts_columns['author'] = __('Author');
 	$posts_columns['categories'] = __('Categories');
 	$posts_columns['tags'] = __('Tags');
@@ -759,13 +760,16 @@ function wp_manage_media_columns() {
 	$posts_columns = array();
 	$posts_columns['cb'] = '<input type="checkbox" />';
 	$posts_columns['icon'] = '';
-	$posts_columns['media'] = _c('File|media column header');
+	/* translators: column name */
+	$posts_columns['media'] = _x('File', 'column name');
 	$posts_columns['author'] = __('Author');
 	//$posts_columns['tags'] = _c('Tags|media column header');
-	$posts_columns['parent'] = _c('Attached to|media column header');
+	/* translators: column name */
+	$posts_columns['parent'] = _x('Attached to', 'column name');
 	$posts_columns['comments'] = '<div class="vers"><img alt="Comments" src="images/comment-grey-bubble.png" /></div>';
 	//$posts_columns['comments'] = __('Comments');
-	$posts_columns['date'] = _c('Date|media column header');
+	/* translators: column name */
+	$posts_columns['date'] = _x('Date', 'column name');
 	$posts_columns = apply_filters('manage_media_columns', $posts_columns);
 
 	return $posts_columns;
@@ -823,7 +827,8 @@ function get_column_headers($page) {
 			$_wp_column_headers[$page] = array(
 				'cb' => '<input type="checkbox" />',
 				'author' => __('Author'),
-				'comment' => _c('Comment|noun'),
+				/* translators: column name */
+				'comment' => _x('Comment', 'column name'),
 				//'date' => __('Submitted'),
 				'response' => __('In Response To')
 			);
@@ -1060,8 +1065,12 @@ function inline_edit_row( $type ) {
 				<span class="input-text-wrap"><input type="text" name="post_password" class="inline-edit-password-input" value="" /></span>
 			</label>
 
-			<em style="margin:5px 10px 0 0" class="alignleft"><?php echo _c( '&ndash;OR&ndash;|Between password field and private checkbox on post quick edit interface' ); ?></em>
-
+			<em style="margin:5px 10px 0 0" class="alignleft">
+				<?php
+				/* translators: Between password field and private checkbox on post quick edit interface */
+				echo __( '&ndash;OR&ndash;' );
+				?>
+			</em>
 			<label class="alignleft inline-edit-private">
 				<input type="checkbox" name="keep_private" value="private" />
 				<span class="checkbox-title"><?php echo $is_page ? __('Private page') : __('Private post'); ?></span>
@@ -2104,7 +2113,7 @@ function _wp_comment_row( $comment_id, $mode, $comment_status, $checkbox = true,
 						}
 					}
 					if ( 'spam' != $the_comment_status )
-						$actions['spam'] = "<a href='$spam_url' class='delete:the-comment-list:comment-$comment->comment_ID::spam=1 vim-s vim-destructive' title='" . __( 'Mark this comment as spam' ) . "'>" . _c( 'Spam|verb' ) . '</a>';
+						$actions['spam'] = "<a href='$spam_url' class='delete:the-comment-list:comment-$comment->comment_ID::spam=1 vim-s vim-destructive' title='" . __( 'Mark this comment as spam' ) . "'>" . /* translators: mark as spam link */ _x( 'Spam', 'verb' ) . '</a>';
 					$actions['delete'] = "<a href='$delete_url' class='delete:the-comment-list:comment-$comment->comment_ID delete vim-d vim-destructive'>" . __('Delete') . '</a>';
 					$actions['edit'] = "<a href='comment.php?action=editcomment&amp;c={$comment->comment_ID}' title='" . __('Edit comment') . "'>". __('Edit') . '</a>';
 					$actions['quickedit'] = '<a onclick="commentReply.open(\''.$comment->comment_ID.'\',\''.$post->ID.'\',\'edit\');return false;" class="vim-q" title="'.__('Quick Edit').'" href="#">' . __('Quick&nbsp;Edit') . '</a>';
@@ -2509,7 +2518,8 @@ function touch_time( $edit = 1, $for_post = 1, $tab_index = 0, $multi = 0 ) {
 	$year = '<input type="text" ' . ( $multi ? '' : 'id="aa" ' ) . 'name="aa" value="' . $aa . '" size="4" maxlength="5"' . $tab_index_attribute . ' autocomplete="off" />';
 	$hour = '<input type="text" ' . ( $multi ? '' : 'id="hh" ' ) . 'name="hh" value="' . $hh . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" />';
 	$minute = '<input type="text" ' . ( $multi ? '' : 'id="mn" ' ) . 'name="mn" value="' . $mn . '" size="2" maxlength="2"' . $tab_index_attribute . ' autocomplete="off" />';
-	printf(_c('%1$s%2$s, %3$s @ %4$s : %5$s|1: month input, 2: day input, 3: year input, 4: hour input, 5: minute input'), $month, $day, $year, $hour, $minute);
+	/* translators: 1: month input, 2: day input, 3: year input, 4: hour input, 5: minute input */
+	printf(__('%1$s%2$s, %3$s @ %4$s : %5$s'), $month, $day, $year, $hour, $minute);
 
 	echo '<input type="hidden" id="ss" name="ss" value="' . $ss . '" />';
 
@@ -3278,7 +3288,8 @@ function _post_states($post) {
 	if ( 'draft' == $post->post_status && 'draft' != $post_status )
 		$post_states[] = __('Draft');
 	if ( 'pending' == $post->post_status && 'pending' != $post_status )
-		$post_states[] = _c('Pending|post state');
+		/* translators: post state */
+		$post_states[] = _x('Pending', 'post state');
 	if ( is_sticky($post->ID) )
 		$post_states[] = __('Sticky');
 
diff --git a/wp-admin/includes/widgets.php b/wp-admin/includes/widgets.php
index 9e15d54855..1ddad038f5 100644
--- a/wp-admin/includes/widgets.php
+++ b/wp-admin/includes/widgets.php
@@ -263,7 +263,8 @@ function wp_widget_control( $sidebar_args ) {
 	unset($wp_registered_widgets[$widget_id]['_callback']);
 
 	if ( $widget_title && $widget_title != $sidebar_args['widget_name'] )
-		$widget_title = sprintf( _c('%1$s: %2$s|1: widget name, 2: widget title' ), $sidebar_args['widget_name'], $widget_title );
+		/* translators: 1: widget name, 2: widget title */
+		$widget_title = sprintf( _x('%1$s: %2$s', 'widget' ), $sidebar_args['widget_name'], $widget_title );
 	else
 		$widget_title = wp_specialchars( strip_tags( $sidebar_args['widget_name'] ) );
 
diff --git a/wp-admin/menu.php b/wp-admin/menu.php
index efdf7b1425..7d8cc39888 100644
--- a/wp-admin/menu.php
+++ b/wp-admin/menu.php
@@ -31,7 +31,8 @@ $menu[4] = array( '', 'read', '', '', 'wp-menu-separator' );
 
 $menu[5] = array( __('Posts'), 'edit_posts', 'edit.php', '', 'wp-menu-open menu-top', 'menu-posts', 'div' );
 	$submenu['edit.php'][5]  = array( __('Edit'), 'edit_posts', 'edit.php' );
-	$submenu['edit.php'][10]  = array( _c('Add New|post'), 'edit_posts', 'post-new.php' );
+	/* translators: add new post */
+	$submenu['edit.php'][10]  = array( _x('Add New', 'post'), 'edit_posts', 'post-new.php' );
 
 	$i = 15;
 	foreach ( $wp_taxonomies as $tax ) {
@@ -46,16 +47,19 @@ $menu[5] = array( __('Posts'), 'edit_posts', 'edit.php', '', 'wp-menu-open menu-
 
 $menu[10] = array( __('Media'), 'upload_files', 'upload.php', '', 'menu-top', 'menu-media', 'div' );
 	$submenu['upload.php'][5] = array( __('Library'), 'upload_files', 'upload.php');
-	$submenu['upload.php'][10] = array( _c('Add New|file'), 'upload_files', 'media-new.php');
+	/* translators: add new file */
+	$submenu['upload.php'][10] = array( _x('Add New', 'file'), 'upload_files', 'media-new.php');
 
 $menu[15] = array( __('Links'), 'manage_links', 'link-manager.php', '', 'menu-top', 'menu-links', 'div' );
 	$submenu['link-manager.php'][5] = array( __('Edit'), 'manage_links', 'link-manager.php' );
-	$submenu['link-manager.php'][10] = array( _c('Add New|links'), 'manage_links', 'link-add.php' );
+	/* translators: add new links */
+	$submenu['link-manager.php'][10] = array( _x('Add New', 'links'), 'manage_links', 'link-add.php' );
 	$submenu['link-manager.php'][15] = array( __('Link Categories'), 'manage_categories', 'edit-link-categories.php' );
 
 $menu[20] = array( __('Pages'), 'edit_pages', 'edit-pages.php', '', 'menu-top', 'menu-pages', 'div' );
 	$submenu['edit-pages.php'][5] = array( __('Edit'), 'edit_pages', 'edit-pages.php' );
-	$submenu['edit-pages.php'][10] = array( _c('Add New|page'), 'edit_pages', 'page-new.php' );
+	/* translators: add new page */
+	$submenu['edit-pages.php'][10] = array( _x('Add New', 'page'), 'edit_pages', 'page-new.php' );
 
 $menu[25] = array( sprintf( __('Comments %s'), "<span id='awaiting-mod' class='count-$awaiting_mod'><span class='pending-count'>" . number_format_i18n($awaiting_mod) . "</span></span>" ), 'edit_posts', 'edit-comments.php', '', 'menu-top', 'menu-comments', 'div' );
 
@@ -75,7 +79,8 @@ if ( !empty($update_plugins->response) )
 
 $menu[65] = array( sprintf( __('Plugins %s'), "<span class='update-plugins count-$update_count'><span class='plugin-count'>" . number_format_i18n($update_count) . "</span></span>" ), 'activate_plugins', 'plugins.php', '', 'menu-top', 'menu-plugins', 'div' );
 	$submenu['plugins.php'][5]  = array( __('Installed'), 'activate_plugins', 'plugins.php' );
-	$submenu['plugins.php'][10] = array(_c('Add New|plugin'), 'install_plugins', 'plugin-install.php');
+	/* translators: add new plugin */
+	$submenu['plugins.php'][10] = array(_x('Add New', 'plugin'), 'install_plugins', 'plugin-install.php');
 	$submenu['plugins.php'][15] = array( __('Editor'), 'edit_plugins', 'plugin-editor.php' );
 
 if ( current_user_can('edit_users') )
diff --git a/wp-admin/themes.php b/wp-admin/themes.php
index d9e7c3b385..247bd2ddc2 100644
--- a/wp-admin/themes.php
+++ b/wp-admin/themes.php
@@ -108,7 +108,9 @@ function theme_update_available( $theme ) {
 <?php if ( $ct->screenshot ) : ?>
 <img src="<?php echo WP_CONTENT_URL . $ct->stylesheet_dir . '/' . $ct->screenshot; ?>" alt="<?php _e('Current theme preview'); ?>" />
 <?php endif; ?>
-<h4><?php printf(_c('%1$s %2$s by %3$s|1: theme title, 2: theme version, 3: theme author'), $ct->title, $ct->version, $ct->author) ; ?></h4>
+<h4><?php
+	/* translators: 1: theme title, 2: theme version, 3: theme author */
+	printf(__('%1$s %2$s by %3$s'), $ct->title, $ct->version, $ct->author) ; ?></h4>
 <p class="description"><?php echo $ct->description; ?></p>
 <?php if ($ct->parent_theme) { ?>
 	<p><?php printf(__('The template files are located in <code>%2$s</code>.  The stylesheet files are located in <code>%3$s</code>.  <strong>%4$s</strong> uses templates from <strong>%5$s</strong>.  Changes made to the templates will affect both themes.'), $ct->title, $ct->template_dir, $ct->stylesheet_dir, $ct->title, $ct->parent_theme); ?></p>
diff --git a/wp-admin/upload.php b/wp-admin/upload.php
index 0922ae975f..99302eaea1 100644
--- a/wp-admin/upload.php
+++ b/wp-admin/upload.php
@@ -302,8 +302,8 @@ foreach ($arc_result as $arc_row) {
 <tr>
 	<th scope="col" class="check-column"><input type="checkbox" /></th>
 	<th scope="col"></th>
-	<th scope="col"><?php echo _c('Media|media column header'); ?></th>
-	<th scope="col"><?php echo _c('Date Added|media column header'); ?></th>
+	<th scope="col"><?php /* translators: column name in media */ echo _x('Media', 'media column name'); ?></th>
+	<th scope="col"><?php /* translators: column name in media */ echo _x('Date Added', 'media column name'); ?></th>
 </tr>
 </thead>
 
@@ -311,8 +311,8 @@ foreach ($arc_result as $arc_row) {
 <tr>
 	<th scope="col" class="check-column"><input type="checkbox" /></th>
 	<th scope="col"></th>
-	<th scope="col"><?php echo _c('Media|media column header'); ?></th>
-	<th scope="col"><?php echo _c('Date Added|media column header'); ?></th>
+	<th scope="col"><?php /* translators: column name in media */ echo _x('Media', 'media column name'); ?></th>
+	<th scope="col"><?php /* translators: column name in media */ echo _x('Date Added', 'media column name'); ?></th>
 </tr>
 </tfoot>